Foamed asphalt compositions, recycled asphalt composition including the same, asphalt pavement including the same, and methods of forming asphalt pavement using the same

Patent metadata

Field	Value
Publication number	US-2017190618-A1
Application number	US-201615370683-A
Country	US
Kind code	A1
Filing date	Dec 6, 2016
Priority date	Dec 31, 2015
Publication date	Jul 6, 2017
Grant date	—

Abstract

Foamed asphalt compositions, recycled asphalt compositions, asphalt pavement, and methods of forming asphalt pavement using the foamed asphalt compositions are provided herein. An exemplary foamed asphalt composition is in a cellular matrix form and includes a base asphalt component and oxidized high density polyethylene. An exemplary asphalt pavement includes a recycled asphalt layer that includes the foamed asphalt composition and a recycled asphalt component. An exemplary method of forming asphalt pavement includes combining a base asphalt component and an oxidized high density polyethylene to form an asphalt mixture. The asphalt mixture is foamed using water and compressed air to form a foamed asphalt composition. The foamed asphalt composition and a recycled asphalt component are combined to form a recycled asphalt composition. A recycled asphalt layer is formed with the recycled asphalt composition.

First claim

What is claimed is:

1 . A foamed asphalt composition comprising:
a base asphalt component; and oxidized high density polyethylene; wherein the foamed asphalt composition is in a cellular matrix form.

2 . The foamed asphalt composition of claim 1 , wherein the oxidized high density polyethylene has a density of from about 0.97 to about 1.01 g/cm 3 .

3 . The foamed asphalt composition of claim 1 , further comprising an additional polyethylene different from the oxidized high density polyethylene and chosen from non-oxidized polyethylene homopolymer, oxidized low density polyethylene, or a combination thereof.

4 . The foamed asphalt composition of claim 3 , wherein the additional polyethylene is oxidized low density polyethylene having a density of from about 0.84 to about 0.95 g/cm 3 .

5 . The foamed asphalt composition of claim 3 , wherein the additional polyethylene is non-oxidized polyethylene homopolymer having a density of from about 0.87 to about 0.98 g/cm 3 .

6 . The foamed asphalt composition of claim 3 , where a combined amount of all polymeric species present in the foamed asphalt composition is from about 2 to about 10.5 weight % based upon a total weight of the foamed asphalt composition on a dry basis.

7 . The foamed asphalt composition of claim 3 , wherein the oxidized high density polyethylene and the additional polyethylene are present in the foamed asphalt composition in a weight ratio of from about 1:2 to about 2:1.

8 . The foamed asphalt composition of claim 1 , produced by:
introducing the base asphalt component, the oxidized high density polyethylene, optionally an additional polyethylene different from the oxidized high density polyethylene, and water to a foam nozzle; and foaming a mixture of the base asphalt component, the oxidized high density polyethylene, by using water and compressed air to form the foamed asphalt composition in the cellular matrix form.

9 . The foamed asphalt composition of claim 8 , wherein water is present in the mixture in an amount of from about 2 to about 5 weight % based upon a total weight of all components present in the mixture.

10 . The foamed asphalt composition of claim 8 , wherein the mixture comprises the additional polyethylene and wherein the mixture has a viscosity of at least about 30,000 Pa·s at a temperature of 60° C. and a viscosity of less than about 150 cP at a temperature of 160° C., wherein viscosity is determined in accordance with ASTM D4402.

11 . A recycled asphalt composition comprising:
the foamed asphalt composition of claim 1 ; and a recycled asphalt component.

12 . An asphalt pavement comprising:
a recycled asphalt layer comprising:
a foamed asphalt composition comprising:
a base asphalt component; and
oxidized high density polyethylene; and

a recycled asphalt component.

13 . The asphalt pavement of claim 12 , wherein the foamed asphalt composition further comprises an additional polyethylene different from the oxidized high density polyethylene and chosen from non-oxidized polyethylene homopolymer, oxidized low density polyethylene, or a combination thereof.

14 . The asphalt pavement of claim 13 , wherein the recycled asphalt layer has an indirect tensile strength of at least 0.45 Mpa as measured in accordance with ASTM D6391-12.

15 . The asphalt pavement of claim 12 , further comprising a hot mix asphalt layer disposed over the recycled asphalt layer.

16 . The asphalt pavement of claim 15 , wherein the hot mix asphalt layer has a thickness of from 4 to less than 8 cm, the recycled asphalt layer has a thickness of from about 10 to about 18 cm, and the recycled asphalt layer has anti-rutting performance of at least 5000 cycles/mm at 60° C. in accordance with T0719-2011 of the Industry Standard JTG E20-2011 Specification and Test Methods of Bitumen and Bituminous Mixture for Highway Engineering, China.

17 . A method of forming asphalt pavement, said method comprising the steps of:
combining a base asphalt component and an oxidized high density polyethylene to form an asphalt mixture; foaming the asphalt mixture using water and compressed air to form a foamed asphalt composition; combining the foamed asphalt composition and a recycled asphalt component to form a recycled asphalt composition; and forming a recycled asphalt layer with the recycled asphalt composition.

18 . The method of claim 17 , wherein the steps of combining to form the asphalt mixture, foaming, combining to form the recycled asphalt composition, and forming the recycled asphalt layer are conducted at ambient temperatures of no greater than about 50° C.

19 . The method of claim 17 , wherein the foamed asphalt composition further comprises an additional polyethylene different from the oxidized high density polyethylene and chosen from non-oxidized polyethylene homopolymer, oxidized low density polyethylene, or a combination thereof.

20 . The method of claim 17 , further comprising forming a hot mix asphalt layer over the recycled asphalt layer.

Assignees

• Honeywell Int Inc

Inventors

• Wang Wei
• Yuan Ruixing
• Shen Yuansheng
• Wang Xiang
• Li Jun

Classifications

• C04B26/26 Primary

  Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)} · CPC title

• C08L95/00 Primary

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C04B24/2611

  Polyalkenes · CPC title

• C08L2555/30

  Environmental or health characteristics, e.g. energy consumption, recycling or safety issues · CPC title

• C08L2555/34

  Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag · CPC title